public class Wrapper{
public String FirstName {get; set;}
public String MiddleName {get; set;}
public String LastName {get; set;}
}

public class myClass{
pubilc Wrapper wap1 {get; set;} // Getting error when defied like this
public void myfun(){
    Wrapper wap = new Wrapper (); // Able to access class from here
}
}